org.orekit.propagation.semianalytical.dsst.utilities.hansen

Class HansenZonalLinear

java.lang.Object

org.orekit.propagation.semianalytical.dsst.utilities.hansen.HansenZonalLinear

public class HansenZonalLinear
extends Object

Hansen coefficients K(t,n,s) for t=0 and n < 0.

Implements Collins 4-242 or echivalently, Danielson 2.7.3-(6) for Hansen Coefficients and Collins 4-245 or Danielson 3.1-(7) for derivatives. The recursions are transformed into composition of linear transformations to obtain the associated polynomials for coefficients and their derivatives - see Petre's paper

Author:

Petre Bazavan, Lucian Barbulescu

Constructor Summary

Constructors

Constructor and Description
HansenZonalLinear(int nMax, int s) Constructor.

Method Summary

Modifier and Type	Method and Description
void	computeInitValues(double chi) Compute the roots for the Hansen coefficients and their derivatives.
double	getDerivative(int mnm1, double chi) Get the dK₀-n-1,s / dΧ coefficient derivative.
double	getValue(int mnm1, double chi) Get the K₀-n-1,s coefficient value.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

HansenZonalLinear

public HansenZonalLinear(int nMax,
                         int s)

Constructor.

Parameters:

nMax - the maximum (absolute) value of n coefficient

s - s coefficient

Method Detail

computeInitValues

public void computeInitValues(double chi)

Compute the roots for the Hansen coefficients and their derivatives.

Parameters:

chi - 1 / sqrt(1 - e²)

getValue

public double getValue(int mnm1,
                       double chi)

Get the K₀^-n-1,s coefficient value.

The s value is given in the class constructor

Parameters:

mnm1 - (-n-1) coefficient

chi - The value of χ

Returns:

K₀^-n-1,s

getDerivative

public double getDerivative(int mnm1,
                            double chi)

Get the dK₀^-n-1,s / dΧ coefficient derivative.

The s value is given in the class constructor.

Parameters:

mnm1 - (-n-1) coefficient

chi - The value of χ

Returns:

dK₀^-n-1,s / dΧ